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Reworking iterator logic regarding failed states during always

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Previous changes addressed a corner case, which unfortunately introduced
another bug. This patch adds a new flag to the host state (did_rescue) which
is set to true when the rescue portion of a block completes. This flag is
then checked in _check_failed_state() when the fail_state != FAILED_NONE.

This lead to the discovery of another bug - current strategies are not advancing
hosts to ITERATING_COMPLETE after doing a peek at the next task, leaving the
host state in the run_state of the final task. To address this, before gathering
the list of failed hosts in StrategyBase.run(), a final pass through the iterator
for all hosts is done to ensure each host is in its final state. This way, no
strategy derived from StrategyBase has to worry about it and it's handled.

Fixes #17983
This commit is contained in:
James Cammarata 2016-11-16 02:01:30 -06:00
commit ca5b361ad8
3 changed files with 34 additions and 21 deletions
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41
lib/ansible/plugins/strategy/__init__.py
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@ -129,6 +129,12 @@ class StrategyBase:
self._results_thread.join()
def run(self, iterator, play_context, result=0):
# execute one more pass through the iterator without peeking, to
# make sure that all of the hosts are advanced to their final task.
# This should be safe, as everything should be ITERATING_COMPLETE by
# this point, though the strategy may not advance the hosts itself.
[iterator.get_next_task_for_host(host) for host in self._inventory.get_hosts(iterator._play.hosts) if host.name not in self._tqm._unreachable_hosts]
# save the failed/unreachable hosts, as the run_handlers()
# method will clear that information during its execution
failed_hosts = iterator.get_failed_hosts()
@ -348,24 +354,25 @@ class StrategyBase:
else:
iterator.mark_host_failed(original_host)
# only add the host to the failed list officially if it has
# been failed by the iterator
if iterator.is_failed(original_host):
# increment the failed count for this host
self._tqm._stats.increment('failures', original_host.name)
# grab the current state and if we're iterating on the rescue portion
# of a block then we save the failed task in a special var for use
# within the rescue/always
state, _ = iterator.get_next_task_for_host(original_host, peek=True)
if iterator.is_failed(original_host) and state and state.run_state == iterator.ITERATING_COMPLETE:
self._tqm._failed_hosts[original_host.name] = True
self._tqm._stats.increment('failures', original_host.name)
else:
# otherwise, we grab the current state and if we're iterating on
# the rescue portion of a block then we save the failed task in a
# special var for use within the rescue/always
state, _ = iterator.get_next_task_for_host(original_host, peek=True)
if state.run_state == iterator.ITERATING_RESCUE:
self._variable_manager.set_nonpersistent_facts(
original_host,
dict(
ansible_failed_task=original_task.serialize(),
ansible_failed_result=task_result._result,
),
)
if state and state.run_state == iterator.ITERATING_RESCUE:
self._variable_manager.set_nonpersistent_facts(
original_host,
dict(
ansible_failed_task=original_task.serialize(),
ansible_failed_result=task_result._result,
),
)
else:
self._tqm._stats.increment('ok', original_host.name)
if 'changed' in task_result._result and task_result._result['changed']: